6H-thiazines-1,3 substituees en position 2 par un groupement labile, electrophiles ambidents
作者:C. Tea-Gokou、J.P. Pradère、J. Villiéras
DOI:10.1016/s0040-4039(00)94516-7
日期:1983.1
Substitution by H2O in the presence of HCl and by NH(CH3)2 occurs at position 2 of 5-acetyl-2-benzylthio-6H-1,3-thiazine without ring opening (in the first step for the amine). Substitution by the softer anion derived from diethylmalonate (and most likely HS−) occurs at position 6 with ring-opening. Subsequent cyclisations give the corresponding thiocarbonyl compounds. All these reactions are accompanied
在不存在开环的情况下,在HCl存在下被H 2 O取代,在不带开环的情况下被NH(CH 3)2取代(5-胺-2-苄硫基-6H-1,3-噻嗪)(在胺的第一步中) 。替代通过从丙二酸二乙酯(和最有可能的HS衍生较软的阴离子- )出现在与开环位置6。随后的环化得到相应的硫代羰基化合物。所有这些反应都伴随有不稳定的苄硫基的消除。